Cisco C4500X SFP port issue

Did you check the log for any clues?

Also, probably a typo the subnetmask you wrote here:

B which is setup as 10.4.0.1 255.255.255.0 with UP/UP status.

Any more details with something like??:

sh int Tei2/1/7 transceiver detail

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Hi spratek -  no such command for "transceiver detial".  The subnetmask is connect.  It's a P2P which has only 2 IPs from point-to-point.

ok, can you tell us what you software version is?

A few other commands we can try and can possibly be helpful:

show idprom interface Te2/1/7

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Let's try it this way (without detail)

show interfaces Te2/1/7 transceiver

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And

show interfaces Te2/1/7

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The subnetmask can be correct, but you typed 2 subnetmasks (255.255.255.252 and 255.255.255.0) hence my question.
Also, did you check the log of the switch for problems?

Another question, is this a single 4500X or is this a VSS? And what is at the other side?

DC-B-c4500X#sh idprom int te2/1/7


GBIC Serial EEPROM Contents:
Common Block:
 Identifier        = SFP [0x3]
 Extended Id       = GBIC is compliant with MOD_DEF 4 [0x4]
 Connector         = LC Connector [0x7]
 Transceiver
  Type             = Gbic 1000BaseLH
  Speed(FC,byte 10)= Not available [0x0]
  Media            = Not available [0x0]
  Technology       = Not available [0x0]
  Link Length      = Not available [0x0]
  GE Comp Codes    = 1000BASE-LX  [0x2] (LX used generically for LX, LH or ZX)
  SONET Comp Codes = Not available [0x0]
  10GE Comp Codes = Extended  [0x0]
 Encoding          = 8B10B  [0x1]
 BR, Nominal       = 1300 Mbps (million bits per second)
 Length(9u) in km  = 10 km
 Length(9u)        = 10000 m
 Length(50u)       = 550 m
 Length(62.5u)     = 550 m
 Length(Copper)    = GBIC does not support copper cables, or the length must
                     be determined from the transceiver technology.
 Vendor name       = CISCO
 Vendor OUI        = 36965
 Vendor Part No.   = FTLF1318P3BTL-C1
 Vendor Part Rev.  = A
 Wavelength        = 1310 nanometers
 CC_BASE           = 0x83

Extended ID Fields
 Options           = Loss of Signal implemented TX_FAULT signal implemented TX_DISABLE is implemented and disables the serial output Linear Receiver Output implemented  [0x1A]
 BR, max           = Unspecified
 BR, min           = Unspecified
 Vendor Serial No. = FNS191119L6
 Date code         = 150311
 Diag monitoring   = Implemented
 Calibration type  = Internal
 Rx pwr measuremnt = Average Power
 Address change    = Not required
 CC_EXT            = 0x1F

Vendor Specific ID Fields:
551CC8C4  00 00 02 AF F4 A1 48 4C D1 02 19 9D 77 E9 7D A0   .../.!HLQ..^]w.}
551CC8D4  C3 17 AD 00 00 00 00 00 00 00 00 00 52 70 05 E7   C...........Rp.g

SEEPROM contents (hex) size 128:
0x0000  03 04 07 00 00 00 02 00 00 00 00 01 0D 00 0A 64   ...............d
0x0010  37 37 00 00 43 49 53 43 4F 20 20 20 20 20 20 20   77..CISCO
0x0020  20 20 20 20 00 00 90 65 46 54 4C 46 31 33 31 38       ...eFTLF1318
0x0030  50 33 42 54 4C 2D 43 31 41 20 20 20 05 1E 00 83   P3BTL-C1A   ...^C
0x0040  00 1A 00 00 46 4E 53 31 39 31 31 31 39 4C 36 20   ....FNS191119L6
0x0050  20 20 20 20 31 35 30 33 31 31 20 20 68 F0 03 1F       150311  h...
0x0060  00 00 02 AF F4 A1 48 4C D1 02 19 9D 77 E9 7D A0   .../t.HLQ..^]wi}.
0x0070  C3 17 AD 00 00 00 00 00 00 00 00 00 52 70 05 E7   C.-.........Rp.g

DC-B-c4500X#

DC-B-c4500X#sh int te2/1/7 transceiver
                                                  ^
% Invalid input detected at '^' marker.

DC-B-c4500X#sh int te2/1/7
TenGigabitEthernet2/1/7 is down, line protocol is down (notconnect)
  Hardware is Ten Gigabit Ethernet Port, address is 0008.e3ff.xxxx (bia 0008.e3ff.xxxx)
  Description: ** Level3 P2P
  Internet address is 10.4.0.2/30
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, Auto-speed, link type is auto, media type is 1000BaseLH
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes
  L3 out Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes
  IPv6 L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes
  IPv6 L3 out Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 8 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
DC-B-c4500X#

Sorry it was a typo for  

B which is setup as 10.4.0.1 255.255.255.0 with UP/UP status

Here is on the other side:

DC-A-c4900-S1#sh run int gi3/3
Building configuration...

Current configuration : 166 bytes
!
interface GigabitEthernet3/3
 description Level3 P2P
 no switchport
 ip address 10.4.0.1 255.255.255.252
 no ip redirects
 no ip unreachables
 no ip proxy-arp
end

DC-A-c4900-S1#

DC-A-c4900-S1#sh int gi3/3 cap
GigabitEthernet3/3
  Model:                 WS-X4920-GB-RJ45-RJ-45
  Type:                  10/100/1000-TX
  Speed:                 10,100,1000,auto
  Duplex:                half,full,auto
  Auto-MDIX:             yes
  EEE:                   no
  Trunk encap. type:     802.1Q
  Trunk mode:            on,off,desirable,nonegotiate
  Channel:               yes
  Broadcast suppression: percentage(0-100), hw
  Multicast suppression: percentage(0-100), hw
  Flowcontrol:           rx-(off,on,desired),tx-(off,on,desired)
  VLAN Membership:       static, dynamic
  Fast Start:            yes
  CoS rewrite:           yes
  ToS rewrite:           yes
  Inline power:          no
  SPAN:                  source/destination
  UDLD:                  yes
  Link Debounce:         no
  Link Debounce Time:    no
  Port Security:         yes
  Dot1x:                 yes
  Maximum MTU:           9198 bytes (Jumbo Frames)
  Multiple Media Types:  no
  Diagnostic Monitoring: N/A
  Queuing:               rx-(N/A), tx-(1p7q1t)
DC-A-c4900-S1#

Here is on the DC-B side:

DC-B-c4500X#sh int te2/1/7 cap
TenGigabitEthernet2/1/7
  Model:                 WS-C4500X-16-Gbic
  Type:                  1000BaseLH
  Speed:                 1000,10000
  Duplex:                full
  Auto-MDIX:             no
  EEE:                   no
  Trunk encap. type:     802.1Q
  Trunk mode:            on,off,desirable,nonegotiate
  Channel:               yes
  Broadcast suppression: percentage(0-100), hw
  Multicast suppression: percentage(0-100), hw
  Flowcontrol:           rx-(off,on,desired),tx-(off,on,desired)
  VLAN Membership:       static, dynamic
  Fast Start:            yes
  CoS rewrite:           yes
  ToS rewrite:           yes
  Inline power:          no
  SPAN:                  source/destination
  UDLD:                  yes
  Link Debounce:         yes
  Link Debounce Time:    yes
  Port Security:         yes
  Dot1x:                 yes
  Maximum MTU:           9198 bytes (Jumbo Frames)
  Multiple Media Types:  no
  Diagnostic Monitoring: N/A
DC-B-c4500X#

Hmmm, looks ok ...

The only thing different that caught my eye was the auto-mdix setting, which is disabled on the 4500x side, normally that shouldn't be a problem but can't hurt to try it out.

Did you try other SFPs? I'm guessing nothing in the logs since you're not mentioning it here...

Interesting, thanks for the info!

Issue resolved with Cisco Support.